All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=766555

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=081513a6a3cef00b8703c88e6cfa1f5d1df84a3533e31fa7dcae35fd4e052e38


Bot(s) for this bug's original alert(s):

android-webview-nexus5X
chromium-rel-mac11-air

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8968030694001875632

=== Auto-CCing suspected CL author ntfschr@chromium.org ===

Hi ntfschr@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Nate Fischer
  Commit : dbc2bb9217483a8ceac23cd41bb8dcc7453c8f4b
  Date   : Fri Sep 15 01:14:47 2017
  Subject: AW: enable PlzNavigate via CLI switch

Bisect Details
  Configuration: android_webview_arm64_aosp_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/mix_blend_mode_animation_difference.html
  Change       : 4.70% | 109.877540431 -> 115.047178649

Revision             Result                  N
chromium@502109      109.878 +- 10.308       14      good
chromium@502116      108.366 +- 2.48953      6       good
chromium@502120      109.005 +- 1.10172      6       good
chromium@502121      116.078 +- 1.91899      6       bad       <--
chromium@502122      116.238 +- 1.44803      6       bad
chromium@502123      116.199 +- 1.22511      6       bad
chromium@502137      115.275 +- 12.7966      21      bad
chromium@502164      115.047 +- 9.44368      14      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=mix.blend.mode.animation.difference.html smoothness.tough_animation_cases

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8968030694001875632


For feedback, file a bug with component Speed>Bisection

This enables PlzNavigate for WebView, so a regression is definitely possible. My CL was already reverted, but 0dbded05ad0ba1c3d8388fd649130509ab97f07a landed before the revert (and just kept PlzNavigate enabled).

CC'ing PlzNavigate folks

---

Also, I assume chromium-rel-mac11-air was a bug in the script? This CL has nothing to do with Mac.

Seems like this is a false report since the bot is mac but this change only affected Android.

 Issue 766558  has been merged into this issue.

alexclark@, are we sure both bots are regressing due to the same change? This particular change only affects WebView, not Mac.

I don't think PlzNavigate affects animation smoothness, so I'm unblocking the PlzNavigate bug. The culprit is probably a different CL.

These regressions are small enough that I don't think we'll get to the bottom of them after 3 months.